Features:Long lifespanNo RF InterferenceInstant start, no flashingSolid State, shockproofSave power more than 90% by ordinary bulbsNo mercury or other hazardous materials, accord with RoHsA 7W LED bulb lasts 40 times longer than a 40W standard incandescentEnergy savings = $30 annually per bulbA 10W LED bulb lasts 40 times longer than a 60W standard incandescentEnergy savings = $40 annually per bulbLong time working, 12 hours/day is perfect, produce low heatWorking environment -20 centigrade-65 centigrade , suitable for unusual climateLED bulbs can last up to 50,000 hrs. - that's over a 10 year life cycle! ( based on 10 hrs. average usage per day / 7 days a week)Save more than 90% of power consumption without losing any brightness, LED becomes the most popular light source all over the world.This ceiling light made of high quality metal materials, safe and long lifespan. Perfect for living room, hall, office, store, super market, hotel, etc